This commit will update the okhttp version to 4.12.0 in pom.xml. This update is done to fix the Github issue #503.

[neelkanth-kaushik]

1. This commit will update the okhttp version to 4.12.0 in pom.xml.
2. okhttp-4.12.0 uses okio-3.6.0. (Reference: https://central.sonatype.com/artifact/com.squareup.okhttp3/okhttp/4.12.0)
3. This update is done to fix the Github issue Transitive dependency okio-jvm has security vulnerability #503.
4. Upgrades Kotlin from 1.7.20 to 1.9.0 in pom.xml. This is done to address the CI workflow errors because okhttp-4.12.0 is pulling okio-3.6.0 which is compiled using Kotlin 1.9.0 but the our SDK's pom.xml is expecting Kotlin metadata compiled with Kotlin 1.7.20.